| 摘要 |
A method and apparatus for detecting motion vectors between a current and a previous frame in a video signal derives wavelet representations of the current and previous frames to thereby generate M layers and stores a current and previous subimage of a lowest frequency band for each layer, wherein each layer has a corresponding resolution and M is a positive integer. Then, a current subimage of a lowest frequency band in an Mth layer having a resolution of a lowest level is motion estimated with respect to a corresponding previous subimage by classifying search blocks in the current subimage and candidate blocks in the previous subimage into predetermined patterns and with these generating motion vectors for the current subimage of the lowest frequency band in the Mth layer. candidate blocks are selected in an (M-i)th layer by using motion vectors for the current subimage of the lowest frequency band in the (M-i+1)st layer, wherein i is an integer ranging from 1 to M-1. The patterns, 720, 750, indicate the comparative values of the pixels within each block. |
